1. What is oil casing C90?
Oil casing C90 is a specific steel grade of oil casing. Oil casing is the lifeline to maintain the operation of oil wells. It is used to support the well wall during drilling and after completion to ensure the normal operation of the drilling process and the entire oil well after completion. C90 is one of the casing steel grades classified according to the strength of the steel itself. Different well conditions and well depths will use different steel grades of casing.
2. What are the characteristics of oil casing C90?
In a corrosive environment, C90 oil casing is required to have corrosion resistance; in places with complex geological conditions, it also needs to have anti-crushing performance to adapt to different well conditions. It can ensure the stable operation of oil wells in more complex environments to a certain extent.
3. What are the main scenarios for oil casing C90?
It is widely used in the field of oil extraction. In various types of oil wells, it is used to support the well wall to ensure the smooth progress of the drilling process and the normal operation of the oil well after completion. It is especially suitable for oil well environments with certain corrosiveness or relatively complex geological conditions, and can effectively avoid problems such as oil well production reduction or scrapping caused by casing damage.
4. What is the production standard of oil casing C90?
In terms of chemical composition, according to SY/T6194-96, the casing and its couplings are made of the same steel grade, with a sulfur content of <0.045% and a phosphorus content of <0.045%; chemical analysis samples are taken according to GB/T222-84, and chemical analysis is performed according to the relevant provisions of GB223. In terms of performance testing, flattening tests (GB246-97), tensile tests (GB228-2010) and water pressure tests are required; hydrostatic pressure tests, flattening tests, sulfide stress corrosion cracking tests, hardness tests, etc. can also be performed according to the American Petroleum Institute API SPEC5CT 1988, 1st edition.
5. What should be paid attention to during the use of oil casing C90?
Pay close attention to the actual working conditions of the oil well, such as whether there is a corrosive environment, pressure changes, etc. Regularly inspect the oil casing to assess whether its corrosion degree, anti-collapse performance, etc. meet the requirements. Once the casing shows signs of damage, timely measures should be taken to repair or replace it to avoid affecting the normal production of the oil well and prevent the entire well from reducing production or even being scrapped.
